It expecting 16.8v and power supply included in the set can handle 110 or 220v, the only thing needed is plug(pin) converter, if you in USA. Hz adjustable by 1. Digit dot in display is fake - "12.34" means 1234 Hz.

I was wondering if some one could tell me what is the maximum power consumption of the SA-V4?  I also wanted to know, when using a voltage converter if the hz reading/setting becomes inaccurate?  In the case that it is thrown off is it at least consistent in how it is off so you can adjust accordingly?  Can you adjust the Hz one Hz at a time?  Sorry to make such a nuisance of myself and thank you for all your help so far.  

We do not accept used jews harps for resale.

We do not accept used jews harps for resale.

Never mind about the second question: I can see now in the description it says Zoltan Szilagyi on it.  Sorry.